Inhomogeneous microstructure and fatigue crack propagation of thick-section high strength steel joint welded using double-sided hybrid fiber laser-arc welding

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dc.contributor.authorFeng, Jiecai
dc.contributor.authorLi, Liqun
dc.contributor.authorChen, Yanbin
dc.contributor.authorTian, Yingzhong
dc.contributor.authorSun, Yongle
dc.contributor.authorZhang, Xuanjun
dc.contributor.authorZhang, Jie
dc.date.accessioned2020-12-14T12:33:59Z
dc.date.available2020-12-14T12:33:59Z
dc.date.issued2020-10-13
dc.description.abstractThe inhomogeneous microstructure and fatigue crack propagation of 30 mm thick-section high strength steel welded joint by double-sided hybrid fiber laser-arc welding were investigated in detail. The results indicated that the average effective grain size of the laser zone was only 1/2 of that of the arc zone, due to the faster cooling rate of the laser resource. The base metal consisted of massive polygonal ferrites and small granular carbides, while fine grained region, the coarse grained region and weld metal were all composed of martensite with a high dislocation density. Compared with the arc zone, the percentage of grain boundaries with high misorientation angle increased 24% for the laser zone, as the average grain size of the laser zone was smaller than that of the arc zone. The results also revealed that the fatigue crack propagation resistance of the welded joint was higher than that of the base metal. Meanwhile, a significant increase in the fatigue crack propagation resistance of the laser zone occurred, as compared with the arc zone, due to the refined grains and the high proportion of the grain boundaries with high misorientation angle (>15°) in the laser zone.en_UK
dc.identifier.citationFeng J, Li L, Chen Y, et al., (2021) Inhomogeneous microstructure and fatigue crack propagation of thick-section high strength steel joint welded using double-sided hybrid fiber laser-arc welding. Optics and Laser Technology, Volume 134, February 2021, Article number 106668en_UK
dc.identifier.issn0030-3992
dc.identifier.urihttps://doi.org/10.1016/j.optlastec.2020.106668
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/16089
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectWeldingen_UK
dc.subjectSteelen_UK
dc.subjectMicrostructureen_UK
dc.subjectFatigueen_UK
dc.subjectFractureen_UK
dc.titleInhomogeneous microstructure and fatigue crack propagation of thick-section high strength steel joint welded using double-sided hybrid fiber laser-arc weldingen_UK
dc.typeArticleen_UK
dcterms.dateAccepted2020-10-06

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